201221012102 has 32 divisors (see below), whose sum is σ = 335342052864. Its totient is φ = 89788686400.

The previous prime is 201221012093. The next prime is 201221012117. The reversal of 201221012102 is 201210122102.

It is a super-2 number, since 2×201221012102² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87503 + ... + 640389.

It is an arithmetic number, because the mean of its divisors is an integer number (10479439152).

Almost surely, 2^201221012102 is an apocalyptic number.

201221012102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

201221012102 is a deficient number, since it is larger than the sum of its proper divisors (134121040762).

201221012102 is a wasteful number, since it uses less digits than its factorization.

201221012102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553204.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 201221012102 its reverse (201210122102), we get a palindrome (402431134204).

Subtracting from 201221012102 its reverse (201210122102), we obtain a square (10890000 = 3300²).

The spelling of 201221012102 in words is "two hundred one billion, two hundred twenty-one million, twelve thousand, one hundred two".